class_docstr: Callback Handler that tracks OpenAI info.
code: def __repr__(self) -> str:
      return (
          f"Tokens Used: {self.total_tokens}\n"
          f"\tPrompt Tokens: {self.prompt_tokens}\n"
          f"\tCompletion Tokens: {self.completion_tokens}\n"
          f"Total Cost (USD): ${self.total_cost:9.6f}"
      )
  
file_path: pandas-ai/pandasai/helpers/openai_info.py
imports: from contextlib import contextmanager
  from contextvars import ContextVar
  from typing import Optional, Generator
label_desc: Use image node_id 1 for calling the OpenAICallbackHandler obj's underlying member method code with example usage: obj.__repr__() and returns: str, self, str, self, str, self, str, self